CN100417301C - Blind switching method in cell load control - Google Patents
Blind switching method in cell load control Download PDFInfo
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- CN100417301C CN100417301C CNB2005101275784A CN200510127578A CN100417301C CN 100417301 C CN100417301 C CN 100417301C CN B2005101275784 A CNB2005101275784 A CN B2005101275784A CN 200510127578 A CN200510127578 A CN 200510127578A CN 100417301 C CN100417301 C CN 100417301C
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Abstract
The present invention provides a blind switching method in cell load control. The method firstly judges whether a cell load is in a congestion state; if the cell load is in a congestion state, mobile stations to be switched are selected in a mobile station in a congested cell, and the mobile stations to be switched are positioned by a mobile station positioning method; then, target cells to be switched are selected according to the positioning result of the mobile stations to be switched, and the mobile stations to be switched are blind switched to the target cells to be switched. The method provided by the present invention not only can reduce the load of the congested cell, but also can raise the success ratio of blind switching.
Description
Technical field
The present invention relates to Wideband Code Division Multiple Access (WCDMA) (WCDMA) mobile communication system field, relate in particular to the blind switching method in a kind of cell load control.
Background technology
Along with the continuous increase of mobile communication subscriber quantity, the possibility that small area jam takes place in the mobile communication system is also increasing, and therefore, a kind of effective cell load control strategy seems extremely important.
(Radio Network Controller RNC) is the control core of WCDMA wireless access network to radio network controller, can carry out the load adjustment to the sub-district that is in congestion state.The method of RNC adjustment load has a variety of, such as transformat, release portion low priority user or the pressure switching part low priority user etc. of the speed that reduces packet switch domain service (PS) interactive service, restriction PS interactive service.Force the switching part low priority user to be meant, when small area jam, RNC forces to switch to other sub-district by initiating blind handoff request with the travelling carriage that needs carry out the load adjustment, but, because RNC in advance and do not know the residing position of travelling carriage, the Target cell that travelling carriage will switch to is also selected at random, and therefore, so blind handover success rate is not very high.
Summary of the invention
In view of this, the object of the present invention is to provide the blind switching method in a kind of cell load control, can either reduce congested cell load, can improve blind handover success rate again.
For achieving the above object, method provided by the invention may further comprise the steps:
A, judge whether cell load is in congestion state, if, execution in step B then, otherwise, process ends;
Select to be switched travelling carriage in B, the travelling carriage in congested sub-district, and to be switched travelling carriage is positioned processing;
C, calculate distance between to be switched travelling carriage and all the normal load adjacent cells according to the positioning result of to be switched travelling carriage, will be apart from the nearest normal load adjacent cell of to be switched travelling carriage as to be switched Target cell, and switch to be switched Target cell with to be switched travelling carriage is blind.
Wherein, the to be switched travelling carriage of the described selection of step B is: the travelling carriage of selecting lowest priority is as to be switched travelling carriage.
The height of described travelling carriage priority is by the size decision of mobile station service weights.
Described mobile station service weights are by class of service, service priority and the service rate factor of travelling carriage read group total and getting in proportion.
The size of the described service rate factor obtains according to the span conversion of service rate.
The described localization process of step B adopt observed time difference OTDOA localization method or the time of advent TOA localization method or center of housing estate CELLID localization method.
Also comprise before the C after the described step B:
Judge whether the current sub-district of living in of to be switched travelling carriage exists with frequency normal load adjacent cell,
If exist, distance between the to be switched travelling carriage of then described calculating and all the normal load adjacent cells, and as to be switched Target cell be with the normal load adjacent cell nearest apart to be switched travelling carriage: calculate to be switched travelling carriage and all with the distance between the normal load adjacent cell frequently, and will be apart from the nearest same frequency normal load adjacent cell of to be switched travelling carriage as to be switched Target cell;
If there is no, distance between the to be switched travelling carriage of then described calculating and all the normal load adjacent cells, and as to be switched Target cell be with the normal load adjacent cell nearest apart to be switched travelling carriage: calculate the distance between to be switched travelling carriage and all the alien frequencies normal load adjacent cells, and will be apart from the nearest alien frequencies normal load adjacent cell of to be switched travelling carriage as to be switched Target cell.
As seen, the present invention at first positions processing to be switched travelling carriage, and selects to be switched Target cell according to positioning result, switches to be switched Target cell with to be switched travelling carriage is blind then, the load of congested sub-district not only can be reduced, blind success rate for switching can be improved again.
Description of drawings
Fig. 1 is a flow chart of the present invention;
Fig. 2 is for selecting a specific embodiment flow chart of to be switched Target cell among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is further detailed explanation below in conjunction with drawings and the specific embodiments.
Referring to Fig. 1, the present invention mainly comprises following step:
Step 101:RNC obtains the load state of the sub-district in self control range, judges whether the sub-district is in congestion state, if then execution in step 102, otherwise process ends;
The load condition of sub-district is divided into two kinds of ascending load state and down load states, and each load condition is divided into congested and normal two sub-states.If the ascending load state of sub-district and down load state are normal condition, then the load condition of sub-district is normal; Otherwise, just think that this sub-district is in congestion state.
RNC can obtain the ascending load state and the down load state of sub-district by traditional technological means, also can be by starting the public-measurement process of interface between RNC and base station (NodeB), require the sub-district periodically to report total received power in broadband (Received Total Wide Band Power, RTWP) and carrier transmit power (Transmitted Carrier Power, TCP) measured value, and, calculate the ascending load state and the down load state of this sub-district according to the RTWP and the TCP measured value of sub-district.RNC carries out periodic RTWP and TCP public-measurement, can constantly know the load condition that the sub-district is current in real time, so that can be in congestion state in the sub-district time, in time removes congested processing.
Step 102: select to be switched travelling carriage;
For the sub-district that is in congestion state, RNC can carry out the load adjustment to congested sub-district, and is congested to remove.When taking blind switch means to carry out the cell load adjustment, at first RNC need select to carry out the object that cell load is adjusted, and promptly selects to be switched travelling carriage.
Owing to exist the travelling carriage of composite service to carry out the mortality of blind switching than higher, for the preferential service quality that guarantees the composite service travelling carriage, improve blind success rate for switching, when selecting to be switched travelling carriage, preferentially select the travelling carriage that single circuit territory (CS) is professional or single packet domain (PS) is professional.For the sub-district that is in congestion state, RNC inserts in the travelling carriage of the professional or single PS business of the single CS of this sub-district at all, and the travelling carriage of selecting lowest priority is as to be switched travelling carriage.RNC can calculate the professional weights of travelling carriage according to parameters such as the class of service of travelling carriage, service priority, service rates, and professional weights are big more, show that then the priority of this travelling carriage is low more.Mobile station service weights P is calculated as follows:
P＝a K
type+b K
prio+c K
rate
Wherein, K
TypeRepresent the class of service of travelling carriage, span is 0～3, and 0 is session service, and 1 is professional for stream, and 2 is interactive service, and 3 is background service;
K
PrioRepresent the service priority of travelling carriage, span is 0～14;
K
RateRepresent the service rate factor, span is 0～7, and converting according to service rate R obtains R and K
RateConversion relation as shown in the table:
| R(Kbit/s) | K rate |
| R≤8 | 0 |
| 8＜R≤16 | 1 |
| 16＜R≤32 | 2 |
| 32＜R≤64 | 3 |
| 64＜R≤128 | 4 |
| 128＜R≤256 | 5 |
| 256＜R≤512 | 6 |
| R＞512 | 7 |
A, b, c are weight factors, can carry out self-defined setting by operator according to the difference to above-mentioned three parameter emphasis.
About selecting the method for to be switched travelling carriage, can select as the case may be, be not limited to above-mentioned a kind of scheme.
Step 103: to be switched travelling carriage is positioned processing;
After having determined to be switched travelling carriage, RNC positions processing to this travelling carriage, mobile station positioning method has a variety of, such as: the GPS (Global Position System) of network assistance (AGPS) localization method, observed time difference (OTDOA) localization method, the TOA time of advent (CELLID+RTT) localization method, center of housing estate (CELLID) localization method etc.The location time delay of each localization method is had nothing in common with each other, and the typical case of AGPS locatees time delay and is about 20 seconds, and the typical case of OTDOA locatees time delay and is about 2 seconds, and the location time delay of CELLID+RTT is about 0.5 second, and the location time delay of CELLID is about 0.01 second; Each localization method just sorts by positioning accuracy, generally is followed successively by from high to low: AGPS, OTDOA, CELLID+RTT, CELLID.
When the sub-district was in congestion state, RNC should remove congested as early as possible, and the location time delay of AGPS is longer, and therefore, the present invention preferentially uses the localization method of OTDOA, CELLID+RTT or CELLID that the determined to be switched travelling carriage of step 102 is positioned processing.Concrete which kind of localization method that uses, stationkeeping ability by travelling carriage is decided, if the stationkeeping ability of travelling carriage is supported the OTDOA localization method, then RNC selects the OTDOA localization method that this travelling carriage is positioned processing, and concrete localization process flow process is consistent with common localization process flow process; If travelling carriage is not supported the OTDOA localization method, but support the CELLID+RTT localization method, then RNC selects the CELLID+RTT localization method that this travelling carriage is positioned processing, and concrete localization process flow process is consistent with common localization process flow process; If travelling carriage does not support all that to OTDOA and CELLID+RTT localization method then RNC selects the CELLID localization method that this travelling carriage is positioned processing, concrete localization process flow process is consistent with common localization process flow process.
Step 104: select to be switched Target cell according to positioning result;
Obtain according to step 103 after the positioning result of to be switched travelling carriage, RNC search for the current sub-district of living in of to be switched travelling carriage all be in the same frequency or the inter-frequency neighboring cell of normal load state, and select the easiest sub-district of blind switching of carrying out as to be switched Target cell.Because for intra-frequency neighboring cell, need not to change receive frequency when travelling carriage switches, blind handover success rate is higher, so RNC preferential intra-frequency neighboring cell of selecting when determining Target cell; And, because different system, such as gsm system, can not be fine operational indicator in the support WCDMA system, therefore when the select target sub-district, different system adjacent cell is not taken in.
Step 105: switch to be switched Target cell with to be switched travelling carriage is blind.
After choosing to be switched travelling carriage and to be switched Target cell, RNC carries out blind switching, switches to be switched Target cell with to be switched travelling carriage is blind, and blind switching flow herein is identical with common blind switching flow.
Behind the blind handoff procedure of execution of step 105, return step 101, repeat said process, till cell load is normal.
Referring to Fig. 2, RNC selects the concrete processing procedure of to be switched Target cell as follows in the step 104:
Step 201:RNC judges whether the current sub-district of living in of to be switched travelling carriage exists with frequency normal load adjacent cell, if exist, then execution in step 202, otherwise, execution in step 203;
Step 202:RNC checks all aerial positions with frequency normal load adjacent cell, and calculate to be switched travelling carriage and all with the distance between the normal load adjacent cell frequently, will be apart from the nearest same frequency normal load adjacent cell of to be switched travelling carriage as to be switched Target cell;
Step 203:RNC checks the aerial position of all alien frequencies normal load adjacent cells, and calculate distance between to be switched travelling carriage and all the alien frequencies normal load adjacent cells, will be apart from the nearest alien frequencies normal load adjacent cell of to be switched travelling carriage as to be switched Target cell.
If the current sub-district of living in of to be switched travelling carriage does not all exist with frequency normal load adjacent cell or alien frequencies normal load adjacent cell, then RNC selects other cell load control method except that blind switching, carry out the adjustment of cell load state, such as: the speed of reduction PS interactive service or release portion low priority user etc.
About selecting the method for to be switched Target cell, can select as the case may be, be not limited to above-mentioned a kind of scheme.
As seen, adopt technical scheme of the present invention, not only can reduce the load of congested sub-district, can improve blind success rate for switching again.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect have been carried out further detailed description; institute is understood that; the above only is specific embodiments of the invention; not in order to restriction the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the blind switching method during a cell load is controlled is characterized in that this method may further comprise the steps:
A, judge whether cell load is in congestion state, if, execution in step B then, otherwise, process ends;
Select to be switched travelling carriage in B, the travelling carriage in congested sub-district, and to be switched travelling carriage is positioned processing;
C, calculate distance between to be switched travelling carriage and all the normal load adjacent cells according to the positioning result of to be switched travelling carriage, will be apart from the nearest normal load adjacent cell of to be switched travelling carriage as to be switched Target cell, and switch to be switched Target cell with to be switched travelling carriage is blind.
2. method according to claim 1 is characterized in that, the to be switched travelling carriage of the described selection of step B is: the travelling carriage of selecting lowest priority is as to be switched travelling carriage.
3. method according to claim 2 is characterized in that, the height of travelling carriage priority is by the size decision of mobile station service weights.
4. method according to claim 3 is characterized in that, described mobile station service weights are by class of service, service priority and the service rate factor of travelling carriage read group total and getting in proportion.
5. method according to claim 4 is characterized in that, the size of the described service rate factor obtains according to the span conversion of service rate.
6. method according to claim 1 is characterized in that, the described localization process of step B adopt observed time difference OTDOA localization method or the time of advent TOA localization method or center of housing estate CELLID localization method.
7. method according to claim 1 is characterized in that, also comprises before the C after the described step B:
Judge whether the current sub-district of living in of to be switched travelling carriage exists with frequency normal load adjacent cell,
If exist, distance between the to be switched travelling carriage of then described calculating and all the normal load adjacent cells, and as to be switched Target cell be: calculate to be switched travelling carriage and all with the distance between the normal load adjacent cell frequently, and will move apart to be switched with the normal load adjacent cell nearest apart to be switched travelling carriage
If there is no, distance between the to be switched travelling carriage of then described calculating and all the normal load adjacent cells, and as to be switched Target cell be with the normal load adjacent cell nearest apart to be switched travelling carriage: calculate the distance between to be switched travelling carriage and all the alien frequencies normal load adjacent cells, and will be apart from the nearest alien frequencies normal load adjacent cell of to be switched travelling carriage as to be switched Target cell.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022673B (en) * | 2007-03-14 | 2010-08-25 | 华为技术有限公司 | Method and device for removing credit degree resource congestion |
| CN101170493B (en) * | 2007-11-12 | 2011-09-21 | 中兴通讯股份有限公司 | A method for processing congestion control in global micro-wave access intercommunication system |
| US8374083B2 (en) * | 2008-07-02 | 2013-02-12 | Qualcomm Incorporated | Methods and systems for priority-based service requests, grants for service admission and network congestion control |
| CN103379571B (en) * | 2012-04-26 | 2016-06-08 | 京信通信系统（中国）有限公司 | Method for handover control, Apparatus and system |
| CN103782627B (en) | 2012-08-22 | 2017-10-17 | 华为技术有限公司 | A kind of method, device and the core net of congestion processing |
| CN103168492A (en) * | 2012-09-22 | 2013-06-19 | 华为技术有限公司 | Same frequency adjacent region selecting method and device |
| CN104378731A (en) * | 2013-08-12 | 2015-02-25 | 中兴通讯股份有限公司 | Blind switching or blind redirection method and system and associated equipment |
| CN108243472B (en) * | 2016-12-27 | 2020-10-30 | 中国移动通信集团浙江有限公司 | 2G-to-4G inter-system reselection method and device |
| CN111800840B (en) * | 2020-06-29 | 2022-10-28 | RealMe重庆移动通信有限公司 | Cell connection control method, device, mobile terminal and storage medium |
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| US5454026A (en) * | 1992-04-07 | 1995-09-26 | Nec Corporation | Mobile communication congestion control system |
| WO1996031076A1 (en) * | 1995-03-31 | 1996-10-03 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method of locating a mobile terminal within the service area of a cellular telecommunication system |
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Effective date of registration: 20211223 Address after: 450046 Floor 9, building 1, Zhengshang Boya Plaza, Longzihu wisdom Island, Zhengdong New Area, Zhengzhou City, Henan Province Patentee after: Super fusion Digital Technology Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |
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